Mechanism for surfacing polishing disks



' Jan; 8,- 1946. J, FINE MECHANISM FOR SURFACING romsn'me DISKS Filed Feb. 28, 1944 s Sheets-Shee t 1 INVENTOR- ja m 17?! Jan. 8, 1946. ,J. FINE 2,392,654'

MECHANISM FOR SURFACING POLISHING bISKS' Filed Feb. 28, 1944 3 Sheets-Sheet 2 INVENTOR. Jami 27m:

Jan. 8, 1946. J. FINE Y 392 6 1 MECHANISM FOR SURFAC'ING POLISHING DISKS Filed Feb. 28, 1944 5 Sheets-Sheet 3 IN V EN TOR.

Patented Jan. 8, 1946 UNITED STATES PATENT MECHANISM FOR SURFACING POLISHING 'DISKS Jacob Fine, New York, Application February 28, 1944 S61-i321 N0. 524,335

iClaims.

the; process oi polishing. diamonds a metal diskis employed which rotates rapidly, ordinarily in horizontal position. The surface of this disk (except for an areaadjacent the center which ordinarily left smooth) is grooved with finelineswhich ordinarily extend in an approximatelsz radial direction but with: slight curvature.-- These g-roovesserve to. hold diamond dust used iorcutting and polishing the. stone. These disks weardovzn with use and have to be resnrfiaced quite. frequently. The re-surfacing by ing on; or the disk. can: move while the pointis app ying the necessary grooves has heretofore cutting inone direction and remain stationary been done by hand and demanded considerable while the. point' i'scutting in the other direction. skill, so that. it has been an expensive operation. It is also possible to arrange the grooves in one This invention relates tora. machine whereby this of these: manners in such away that they are work. can be. done substantially automatically. spaced partsomewhatiurther thanihas.beeniin-- Such a machine may be either an independent machine for receiving thedisks removed from the polishing: bench or it may take the form ofan attachment so that. the disks are re-surf'aced without being removed from the. polishing bench. In either. case the disk should b ground smooth before the striping operation. Where a separate mechanism is used, this; grinding mechanism may be. of any desired type. Where the striping or grooving, is' carried outwithout removing the. disk from its place on the; polishing bench, grinding mechanism will ordinarily be supplied so that the: dishv can alsobeground while in place on the polishingrbenclr. In= either case (-afterth grindingi), it, is an essential: that mechanism. be supplied for rotating the. disk quite slowly during the. time that, the. striping operation. is being carried out. Where the dishis to be: re-surfaced in. cutting pointis helda place; this will. takethe tom of: separate. gear- '35 Referring to the drawings, the: letter D indiing which may operate through'thewusual drive. cates: the dish to be: surfaced and this disk is In. orderto carry out the stripin operation, here shown: as. made: integral with. a shaft S; It. anarm isv pivoted adjacent the. edge. of. the disk is; alsounderstood that the shaft: S ordinarily will which; carriesatthe moving end a cutting point. carry a. geariwhich is: not here shown but pro, Thiszarm is, of suchlengththatwhenzthecutting. vision must be: made. for" its. accommodation. 1 point is, on the periphery oiithe: disk,. the: arm is The disk D is: carried. by the rotating: table l'll approximately parallel. to a; tangent drawn, to. where any desired mechanisnris: used: to hold; it: that; point. Means is: supplied for moving this In this case the table to. is: shown. as. provided armback and forth from the approximate periphwiththree toothed. blocks l2 arranged at even crypt the disk to the edge of: the, inner; zone spacing: around. the periphery; Each; of. these which. is left. smooth and thereby grooves of blocks cooperates witha toothed plate 1.4 which propel: configuration are applied. is tensioned toward the table It by albolt l6 car- 7 I have: found it preferable (thoughinot always ryi'ng a spring I'8'.' The plates I4 are provided: essentialfl -to. have the; cutting take place only on with jaw members 20' for engaging. the edge. or the outward stroke-, and: prefer; to have thedi-sk the: dishD; The bolts it pass through. sl'otsgin remainstationary duringt he time that a groove the table ill so that the plates I4 can be moved: is being cut. The cutting point is then raised in or out to take careof disksof'difierentidierm and-moved outwardly and; while this: movement eter; i is taking, place, the; disk advanced to the posir Qne: or more; of the plates this subdivided inter. tiomior. next cutto be made. 'Ifhe grooves." two. parts asashowmirr Eig..3andt azbolt 274m pro are very fine and quite close together. For ex deep and-* ample they may be about .601 inch spaced apart. .093 inch.

Th operation described gives apreferred pat-- tern of grooves onthe; surface of thedi'sl-r' but other patterns: may be used if desired. For ex ample-it is possible to reciprocate the cutting point in out over. the disk and have it out in both directions. and to have the disk moving very slowly butcontinuously while the cutting is go dicated and then apply a second 'setof grooves which come between: and intersectthem-t 'Tllhes'e" ar merely details dependingon the adjustment ofthe mechanism but. I will describe the mechanism set up so that I get. the preferred pattern: of slightly curved; approximately radiall'mes This invention can readily be: understood reference tothe accompanying. drawings in which I describe a complete. machine for receiving disks:

In these drawings,.1=ig.. 1 is a lan view of a. mechanism' removedirom the polishing: bench;

embodying my invention showin a disk; in place but: with; a part oi the disk. broken away; Fig. 2 isv a sectional; side view; Fig 3 is a sectionon! line 3-3 of Fig; 11;: Fig. 4 is. a detailed: view oi? one of the. clamps for gripping. the: disk, and Fig, 51 is a.

detailed: view showing the manner in. which. the

vided for moving the jaw member toward the 7 center in' order to lock the disk D in place.

The table II] is open through the center to receive the shaft S and any gear which it may carry. The table is attached to a sleeve 24 which rotates in a bearing ring 26 carried by the main plate 28 of the structure. It is to -be understood that this plate 28 is supported by any desired form of framework, not shown.

The sleeve 24 and the table I8 are rotated by a motor 30 carrying a worm 32 cooperating with a gear 34 mounted on the shaft 36. Likewise mounted on the shaft 36 is the eccentric crank 38 which gives a reciprocating movement to the arm '40. The connection between the crank 38 and the arm 40 is by means of a' slot and pin as shown in Fig. 1, and by adjusting the position of attachment the degree ofangular movement given to the arm 48 can be varied. j v V The arm 48 is mounted on a shaft 42 which likewise: carries the toothed disk 44 to which is connected the horizontal bevelled gear 46. The arm 40 carries a pawl 48 which cooperates with the teeth of disk 44 to advance this disk a Predeterminednumberrof tooth spaces (depending on the point of attachment of crank 38) for each reciprocation of the arm 48. A detent 50 prevents the disk 44 from turning in the reverse direction.

.A horizontal shaft 52 mounted in a bracket 154 carries at one. end a bevelled gear 56 which operates with the bevelled gear 46 and at the other end carries a worm 58 which cooperates with a gear 80 carried by the sleeve 24. It will thus be apparent that for each rotation of the shaft 38 the table .l0'is rotated a small angular ing in a clockwise direction and remains stationary during the time thatthe-arm 48 is moving in a counterclockwise position.

The cutting tool is carried by an arm 6| which is'pivotally mounted in'a .bracket 62 and is supported near its-outer end by the wheel 64 which moves on a track 66;

.Reciprocatory movement is given to the arm "60 'bythecrank 68 eccentrically mounted on thedisk 10 carried by the. shaft 38 so that for each clamped in a bracket '14. This tool may have a point of hardened alloy steel but preferably it is providedwith a diamondpoint. The bracket1l4 is clamped on'the shaft 18 by a collar 18. A torsion spring 88 surrounds the shaft 16 and exerts a strong pressure tending to hold the tip of the cutting tool l2v down on the disk;

In my preferred embodiment the cutting tool contacts withthe disk only as it moves out from the center, and mechanism is provided to lift'it 1 during the return movement. This mechanism comprises a camf82 carried by the shaft36 which cooperates with the cam roller 84. The cam roller' 84 is carried by a'plunger 88 tensioned toward the. cam 82 .by-the spring 88. The other end of the plunger 86 contacts with the vertical arm; of

a bell crank lever 98 (see Fig. 3). The horizontal arm of this lever contacts the vertical plunger 92 whichpassesdown through the arm 68. At

its upper end the plunger 92 is bent horizontal as shown at 94 and carries a sleeve 96 having an extension which runs underneath an arm I08 which is preferably formed integral with the tool shaft '16. The cam 82 is so designed that when the arm reaches its outermost position (as shown in Fig. 1) the cam wheel 84 is about to ride up on the cam to operate through the bell crank lever 98 and lift the plunger 92and thereby lift the cutting tool from the disk to be treated. When the tool is moved in to the point where thecut should start, the cam 82 permits the cutting tool to drop back under the tension of the torsion spring 88 so that as the tool is moved outwardly a cut is formed in the disk that is being finished.

I have not provided any automatic mechanism for stopping the devicewhen a disk D has made a complete rotation, but such a mechanism can be readily be added if it is thought desirable.

While I have illustrated my invention as a separate mechanism for re-surfacing disks removed from the usual polishing benches, it is also possi ble to correlate the cutting arm with the drivin mechanism of the disk in the polishing machinein which it is used, by the simple expedient of connecting proper mechanism to the'type of drive already there, so that the desired slow rotation the necessary movement to the cutting point so that it will pass over the surface of the disk and for imparting the necessary slow rotation to the disk. This rotation should be soslow that a point.

on the edge of the disk will not advance more than -007 inch each time that the cutting arm passes over its surface and preferably not more 1 Thus than about .003 inch for each such pass. even if the machine is operated at a speed to give rapid reciprocation to the cutting arm, it will take a 12-inch disk considerably more than one- I half hour to make one revolution.

It is understood that the example given is in- V tended only as an illustration and that the'same may be modified in many particulars withoutdeparting from the spirit of my invention.

WhatI claim is: r

1,. In combination with means for supporting a polishingdisk and giving it a rotary movement about its axis, a mechanism for striping the sur- 7 face of such disk comprising means whereby the disk may be turned throughout 360 degrees aboutits axis, a cutting arm pivoted outside the zone of the disk, a cutting point carried by the arm in such a waythat when the arm is moved overthe disk thepoint will move in a curving but approx imately radial direction relative'to the "disk, 1 meansfor giving the cutting arm such a move V ment over the disk, and means for pressing the cutting point against the face of the diskso'that i it will cut grooves in the surface of the disk.

2. A structure as specified in claim I, in which the means for giving the disk a rotary movement comprises mechanism whereby the disk is" given so that the disk remains stationary when the cut ting point is pressed against the disk but moves when the cutting point is out of contact with the disk. 1 I

3. A structure as specified in claim 1, in which mechanism is supplied so' that the cutting point contacts with the disk when moving away from the center 01 the disk but does not out as the cutting arm is moved toward the center of the disk.

4. In combination with means for supporting and rotating a polishing disk, a mechanism for striping the surface of such disk comprising means whereby the disk is given an intermittent rotation, at cutting arm ivoted outside the zone of the disk, a cutting point carried by the arm in such a way that when the arm is reciprocated over the disk the point will move in a curved but approximately radial direction relative to the disk, means for giving the cutting arm such a reciprocatory movement over the disk, means for pressing the cutting point against the surface of the disk while the cutting arm is moving outwardly but for lifting it out of contact with the disk when the cutting arm is moving inwardly, and mechanism for correlating the movement of the cutting arm and the movement of the disk so that the disk remains stationary when the cutting point is in contact with it but moves while the contact point is out of contact with it.

5. A structure as specified in claim 4, in which the means for supporting a polishing disk is formed with a large central aperture so that the mechanism will receive a polishing disk carrying a centrally located shaft.

JACOB FINE. 

